The values are easy to extract after this. Since there are no NeXML files with geographic coordinates attached to nodes, and manually making changes in an NeXML files is a cumbersome process I am thinking of creating a utility which takes an NeXML file as input and a csv file which stores the lat/long and other metadata and the program should be able to attach the latitude/longitude metadata to the NeXML file. I still have to consult this with my mentor !!!